Eh, I don't see any reason you can't run a PF2e scenario in 2 hours featuring some roleplaying, a short journey to arrive at wherever the scenario's goal is, and a combat or two to show the 3 phases of the game, how actions work, and how the 3 action economy works in combat. If I were running a game that I remotely thought new players could be in, I would present simple pregen options and cheat sheet cards featuring the basics (basically what's in the Beginner Box). Most of the rules don't need to be explained beyond just asking the player what they're doing and having the GM work out the mechanical impact and telling the player to roll when needed.